Mercurial > hg > octave-nkf

annotate scripts/help/print_usage.m @ 8575:f134925a1cfa

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
m-file implementation of help system
author Soren Hauberg <soren@hauberg.org>
date Thu, 22 Jan 2009 18:22:52 -0500
parents
children 52956d669506
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8575
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
1 ## Copyright (C) 2009 S�ren Hauberg
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
2 ##
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
3 ## This program is free software; you can redistribute it and/or modify it
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
4 ## under the terms of the GNU General Public License as published by
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
5 ## the Free Software Foundation; either version 3 of the License, or (at
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
6 ## your option) any later version.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
7 ##
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
8 ## This program is distributed in the hope that it will be useful, but
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
11 ## General Public License for more details.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
12 ##
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
13 ## You should have received a copy of the GNU General Public License
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
14 ## along with this program; see the file COPYING. If not, see
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
15 ## <http://www.gnu.org/licenses/>.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
16
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
17 ## -*- texinfo -*-
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
18 ## @deftypefn {Function File} {} print_usage ()
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
19 ## @deftypefnx{Function File} {} print_usage (@var{name})
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
20 ## Print the usage message for a function. When called with no input arguments
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
21 ## the @code{print_usage} function displays the usage message of the currently
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
22 ## executing function.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
23 ## @seealso{help}
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
24 ## @end deftypefn
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
25
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
26 function print_usage (name)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
27 ## Handle input
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
28 if (nargin == 0)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
29 ## Determine the name of the calling function
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
30 x = dbstack ();
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
31 if (numel (x) > 1)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
32 name = x (2).name;
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
33 else
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
34 error ("print_usage: invalid function\n");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
35 endif
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
36 elseif (!ischar (name))
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
37 error ("print_usage: input argument must be a string");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
38 endif
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
39
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
40 ## Do the actual work
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
41 [text, format] = get_help_text (name);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
42 max_len = 80;
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
43 switch (lower (format))
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
44 case "plain text"
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
45 [usage_string, status] = get_usage_plain_text (text, max_len);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
46 case "texinfo"
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
47 [usage_string, status] = get_usage_texinfo (text, max_len);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
48 case "html"
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
49 [usage_string, status] = get_usage_html (text, max_len);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
50 case "not found"
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
51 error ("print_usage: `%s' not found\n", name);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
52 otherwise
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
53 error ("print_usage: internal error: unsupported help text format: '%s'\n", format);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
54 endswitch
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
55
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
56 ## Raise the final error
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
57 if (status != 0)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
58 warning ("makeinfo: Texinfo formatting filter exited abnormally");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
59 warning ("makeinfo: raw Texinfo source of help text follows...\n");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
60 endif
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
61
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
62 error ("Invalid call to %s. Correct usage is:\n\n%s\n%s",
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
63 name, usage_string, __additional_help_message__ ());
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
64 endfunction
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
65
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
66 function [retval, status] = get_usage_plain_text (help_text, max_len)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
67 ## Extract first line by searching for a double line-end.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
68 line_end_idx = strfind (help_text, "\n\n");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
69 retval = help_text (1:min ([line_end_idx , max_len, length(help_text)]));
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
70 status = 0;
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
71 endfunction
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
72
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
73 function [retval, status] = get_usage_texinfo (help_text, max_len)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
74 ## Lines ending with "@\n" are continuation lines, so they should be
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
75 ## concatenated with the following line.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
76 help_text = strrep (help_text, "@\n", " ");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
77
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
78 ## Find, and keep, lines that start with @def or @end def. This should include things
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
79 ## such as @deftypefn, @deftypefnx, @defvar, etc. and their corresponding @end's
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
80 def_idx = strfind (help_text, "@def");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
81 if (!isempty (def_idx))
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
82 buffer = "";
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
83 endl_idx = find (help_text == "\n");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
84 for k = 1:length (def_idx)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
85 endl = endl_idx (find (endl_idx > def_idx (k), 1));
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
86 if (isempty (endl))
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
87 buffer = strcat (buffer, help_text (def_idx (k):end), "\n");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
88 else
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
89 buffer = strcat (buffer, help_text (def_idx (k):endl));
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
90 endif
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
91 endfor
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
92
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
93 end_def_idx = strfind (help_text, "@end def");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
94 if (!isempty (end_def_idx))
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
95 buffer = strcat (buffer, help_text (end_def_idx:end));
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
96 endif
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
97 else
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
98 [retval, status] = get_usage_plain_text (help_text, max_len);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
99 endif
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
100
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
101 ## Run makeinfo to generate plain text
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
102 [retval, status] = makeinfo (buffer, "plain text");
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
103 endfunction
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
104
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
105 function [retval, status] = get_usage_html (help_text, max_len)
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
106 ## Strip tags
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
107 [help_text, status] = strip_html_tags (help_text);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
108
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
109 ## Extract first line with plain text method.
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
110 retval = get_usage_plain_text (help_text, max_len);
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
111 endfunction
f134925a1cfa m-file implementation of help system
Soren Hauberg <soren@hauberg.org>
parents:
diff changeset
112